Hideyori Toyotomi was born on 8 September 1593 in Osaka Castle. As a child he was known by the name Hiroimaru. His mother was Yodogimi, the eldest daughter of Oda Nobunaga’s younger sister Odani-no-kata. Hideyoshi, because his first son had died in infancy, doted on the boy and had him brought up at Fushimi Castle in Kyoto. Lacking a son of his own, Hideyoshi had earlier adopted an heir named Hidetsugu, but in 1595 Hide- tsugu incurred his foster father’s displeasure and was forced to commit suicide. This left Hideyori as sole heir.
In 1598 Hideyoshi, aware that death was near, called upon Tokugawa Ieyasu and the other powerful military leaders of the time to support his son, repeatedly demanding that they swear oaths of fealty, and succumbed to illness shortly after.